Fermentation Yeast Lab

Yeast are micro-organisms that are more closely related to a mushrooms (they are a single-celled fungi) than to bacteria. Fungi are not green, do not have chlorophyll, and cannot undergo photosynthesis to make their own food. Instead, yeast must get their food from their surrounding environment. Yeasts use sugars (simple carbohydrates) and starches (complex carbohydrates) as food sources.Yeast break down these sugar molecules to make energy and release carbon dioxide gas (CO2) as a result. The carbon dioxide gas is what makes a slice of bread so soft and spongy. The pockets of gas are produced by yeast when the dough is allowed to rise before baking. This is the process of fermentation. Fermentation is also used to make beer, wine, and champagne. In this lab we will be examining how the presence of sugar changes how yeast is able to ferment and produce carbon dioxide gas.

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What ingredients are needed for cellular respiration

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What products are created by cellular respiration?

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Where does cellular respiration occur?

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If oxygen is not present what process follows glycolysis?

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After watching the video above, which balloon grew the biggest?

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What was the independent variable (what was changed) in the experiment?

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What gas was produced by the yeast?

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Explain why the bottle with no sugar did not produce gas?

1

What ingredients are needed for cellular respiration

What products are created by cellular respiration?

Where does cellular respiration occur?

If oxygen is not present what process follows glycolysis?

After watching the video above, which balloon grew the biggest?

What was the independent variable (what was changed) in the experiment?

What gas was produced by the yeast?

Explain why the bottle with no sugar did not produce gas?

What is the purpose of fermentation?